View Compilation Error

0_0_21879674_24342.cpp: In function 'void work()':
0_0_21879674_24342.cpp:98:44: error: 'w' was not declared in this scope
    add(i + n, t, inf + (S[i] - T[i] + 1) * w[i]);
                                            ^
0_0_21879674_24342.cpp:101:40: error: 'w' was not declared in this scope
    add(s, i, inf - (S[i] - T[i] + 1) * w[i]);
                                        ^
0_0_21879674_24342.cpp:109:10: error: 'ans' was not declared in this scope
  cout << ans  + inf * n << endl;
          ^